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Hello, And while I am here. . .

Discussion in 'New Member Introductions' started by MarineDeuce, Jun 18, 2017.

  1. Jun 18, 2017 at 6:47 AM
    #1
    MarineDeuce

    MarineDeuce [OP] New Member

    Joined:
    Jun 18, 2017
    Member:
    #1578
    Messages:
    2
    Gender:
    Male
    First Name:
    Ron
    St Johns, AZ
    Vehicle:
    04 Grand Cherokee Limited
    None
    New to Jeeps. Dad had an old Willys on the farm years ago. Learned to drive standing on the drivers seat and turning the ignition switch off to stop. Had a throttle set so dad could give it some gas and turn me lose. Now have an 04 Grand Cherokee Limited 4.7 HO with the 247j t/c. 60 cycle vibration at 75 mph. Slight motion at rear drive shaft yoke where it enters t/c. Suspect t/c extension bushing and or rear main shaft bearing. No leaks at seal. Thoughts?
     
  2. Jun 18, 2017 at 10:14 AM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

    Joined:
    Jul 19, 2016
    Member:
    #2
    Messages:
    4,048
    Gender:
    Male
    Welcome! The vibrations sound like it could be a bearing?
     
  3. Jun 18, 2017 at 11:40 AM
    #3
    aggrex

    aggrex Well-Known Member

    Joined:
    Sep 12, 2016
    Member:
    #203
    Messages:
    4,007
    DE
    Vehicle:
    Backcountry '16
    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Welcome! Just curious....at 75mph could the vibration be due to other issues on an older vehicle (i'm sure you eliminated the ez ones). Does the vibration cycle change at lower or higher speeds?
     
  4. Jun 18, 2017 at 12:08 PM
    #4
    MarineDeuce

    MarineDeuce [OP] New Member

    Joined:
    Jun 18, 2017
    Member:
    #1578
    Messages:
    2
    Gender:
    Male
    First Name:
    Ron
    St Johns, AZ
    Vehicle:
    04 Grand Cherokee Limited
    None
    Well, nothing under the Jeep in the drive line assemblies moves at all other than the output yoke for the rear differential driveshaft where it exits the extension housing on the transfer case. If I grip the ujoint at that location and push up and pull down I can get a slight motion of the yoke at the rear end of the transfer case extension. No oil leaking so seal is still OK. The main shaft through this transfer case has two bearings - one front and one rear and the extension housing has a bushing inside just inside the seal. At road speeds, the drive shaft spins at about 60 to 70 rounds per second. That is the freq of this vibration and it is most noticeable, though still rather minor, at 75 mph. Since the yoke is a splined slip fit over the rear end of the main output shaft, any up and down play should be stopped by the bushing in principle I think. Am I wrong about this? It appears the rear bearing, bushing and seal are rather easily replaced, yes?
     
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